Auto merge of #60296 - Centril:rollup-qh9la7k, r=Centril

Rollup of 12 pull requests

Successful merges:

 - #59734 (Prevent failure in case no space left on device in rustdoc)
 - #59940 (Set cfg(test) when rustdoc is running with --test option)
 - #60134 (Fix index-page generation)
 - #60165 (Add Pin::{into_inner,into_inner_unchecked})
 - #60183 (Chalkify: Add builtin Copy/Clone)
 - #60225 (Introduce hir::ExprKind::Use and employ in for loop desugaring.)
 - #60247 (Implement Debug for Place using Place::iterate)
 - #60259 (Derive Default instead of new in applicable lint)
 - #60267 (Add feature-gate for f16c target feature)
 - #60284 (Do not allow const generics to depend on type parameters)
 - #60285 (Do not ICE when checking types against foreign fn)
 - #60289 (Make `-Z allow-features` work for stdlib features)

Failed merges:

r? @ghost

1 files changed, 34 insertions, 0 deletions

diff --git a/src/libcore/pin.rs b/src/libcore/pin.rs
index dbf3dcf03a3..e74ed9b7889 100644
--- a/src/libcore/pin.rs
+++ b/src/libcore/pin.rs
@@ -349,6 +349,18 @@ where
         // around pinning.
         unsafe { Pin::new_unchecked(pointer) }
     }
+
+    /// Unwraps this `Pin<P>` returning the underlying pointer.
+    ///
+    /// This requires that the data inside this `Pin` is [`Unpin`] so that we
+    /// can ignore the pinning invariants when unwrapping it.
+    ///
+    /// [`Unpin`]: ../../std/marker/trait.Unpin.html
+    #[unstable(feature = "pin_into_inner", issue = "60245")]
+    #[inline(always)]
+    pub fn into_inner(pin: Pin<P>) -> P {
+        pin.pointer
+    }
 }
 
 impl<P: Deref> Pin<P> {
@@ -434,6 +446,28 @@ impl<P: Deref> Pin<P> {
     pub fn as_ref(self: &Pin<P>) -> Pin<&P::Target> {
         unsafe { Pin::new_unchecked(&*self.pointer) }
     }
+
+    /// Unwraps this `Pin<P>` returning the underlying pointer.
+    ///
+    /// # Safety
+    ///
+    /// This function is unsafe. You must guarantee that you will continue to
+    /// treat the pointer `P` as pinned after you call this function, so that
+    /// the invariants on the `Pin` type can be upheld. If the code using the
+    /// resulting `P` does not continue to maintain the pinning invariants that
+    /// is a violation of the API contract and may lead to undefined behavior in
+    /// later (safe) operations.
+    ///
+    /// If the underlying data is [`Unpin`], [`Pin::into_inner`] should be used
+    /// instead.
+    ///
+    /// [`Unpin`]: ../../std/marker/trait.Unpin.html
+    /// [`Pin::into_inner`]: #method.into_inner
+    #[unstable(feature = "pin_into_inner", issue = "60245")]
+    #[inline(always)]
+    pub unsafe fn into_inner_unchecked(pin: Pin<P>) -> P {
+        pin.pointer
+    }
 }
 
 impl<P: DerefMut> Pin<P> {